Iterative Calculation of Characteristic Modes Using Arbitrary Full-wave Solvers

TL;DR

This paper introduces an iterative, matrix-free method for calculating characteristic modes of arbitrary objects using full-wave solvers, significantly speeding up the process without needing explicit system matrices.

Contribution

It presents a novel iterative algorithm that enables characteristic mode analysis with arbitrary full-wave solvers, eliminating the need for explicit matrices and enhancing computational efficiency.

Findings

Achieves significant speed-up over traditional methods

Applicable to objects of arbitrary shape and material

Validated with commercial software examples

Abstract

An iterative algorithm is adopted to construct approximate representations of matrices describing the scattering properties of arbitrary objects. The method is based on the implicit evaluation of scattering responses from iteratively generated excitations. The method does not require explicit knowledge of any system matrices (e.g., stiffness or impedance matrices) and is well-suited for use with matrix-free and iterative full-wave solvers, such as FDTD, FEM, and MLFMA. The proposed method allows for significant speed-up compared to the direct construction of a full transition matrix or scattering dyadic. The method is applied to the characteristic mode decomposition of arbitrarily shaped obstacles of arbitrary material distribution. Examples demonstrating the speed-up and complexity of the algorithm are studied with several commercial software packages.